Compare at least three written quotes and check that each installer holds the required electrical licence and current Clean Energy Council accreditation. Ask about panel and inverter warranties, roof condition, coastal corrosion protection, wind-loading requirements and who will handle the Energex connection application. Make sure the quote clearly separates the system price, any Small-scale Technology Certificate discount, installation costs and possible switchboard or meter upgrades. Check recent local reviews and references, read the contract carefully, and confirm that any claimed incentive is subject to government rules and your individual circumstances.